"Every one of the last five episodes kind of has its own place," Peterson told Entertainment Weekly. "We very purposefully planned. The first one back [is] kind of a thriller that is really heartwarming."

He continued: "Then we have 'Booster' that is [about] this really fun, glossy superhero that's come to town and thrown a wrench in Clark's plans."

Peterson explained that the penultimate episode 'Prophecy' contains "a surprise" and "pushes us off in a really big, emotional way... toward the finale".

"The characters have a big, emotional journey going into the finale," he explained. "But [those episodes also explain] a little bit of the mythology thread we've woven through the season. It really revs that up. So we get to see our big baddie coming as we go toward the finale."

He also described the returning Michael Rosenbaum as playing a "supporting role" in the series finale, which will air on May 13.

"Everybody that is in the finale plays a supporting role in Clark getting toward his ultimate moment," he confirmed. "Michael is no different from the other characters in that, and he's very important. But [the finale is really] about Clark."